Feudalism is the denomination of the predominant political system in Western Europe of the middle centuries of the Middle Ages (between the 9th and 15th centuries), and in Eastern Europe during the Modern Age, characterized by the decentralization of political power; based on the diffusion of power from the top (where in theory were the emperor or kings) to the base where local power was exercised effectively with great autonomy and independence by an aristocracy, called nobility.
it is generally assumed it was a singularity in time and space, which started to exist when and after the big bang. if you want, i can add some articles you may want to read!
1996 if you did not go through young 5s
1995 if you did go through young 5s